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  <title>create_signature (ZooomrRestAPI)</title>
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  <pre><span class="ruby-comment cmt"># File Zooomr.rb, line 75</span>
  <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">create_signature</span>(<span class="ruby-identifier">a_params</span>)
    <span class="ruby-comment cmt"># start with the shared secret</span>
    <span class="ruby-identifier">ascii_sig</span> = <span class="ruby-ivar">@shared_secret</span>
    
    <span class="ruby-comment cmt"># append all the params in alphabetical order</span>
    <span class="ruby-identifier">a_params</span>.<span class="ruby-identifier">sort</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">key</span>, <span class="ruby-identifier">value</span><span class="ruby-operator">|</span>
      <span class="ruby-identifier">ascii_sig</span> <span class="ruby-operator">+=</span> <span class="ruby-identifier">key</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">value</span>.<span class="ruby-identifier">to_s</span>
    <span class="ruby-keyword kw">end</span>
    
    <span class="ruby-comment cmt"># turn it into a MD5 digest</span>
    <span class="ruby-comment cmt">#puts &quot;ASCII SIG: &quot; + ascii_sig</span>
    <span class="ruby-keyword kw">return</span> <span class="ruby-constant">Digest</span><span class="ruby-operator">::</span><span class="ruby-constant">MD5</span>.<span class="ruby-identifier">hexdigest</span>(<span class="ruby-identifier">ascii_sig</span>)
  <span class="ruby-keyword kw">end</span></pre>
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